Pumping device



D. A. HARNER May-5, 1931.

PUMPING DEVICE Filed Jan. 25, 1930 Y INVENTOR czvzldBA. Warne/7*:

ATTORN Patented May 5, 1931 g r UNITED .STATES DAVD A. HARNER,-OF CEDAR FALLS, IOWA.

PUMPIVNG DEVICE Appnqanon sled January 25, 1930; serial no. 423,482.

My invention relates to improvements in pumping devices, and the object of my improvement is to provide a pump of an inexpensive, simply constructed character, and

whichV in operation' saves power as compared with othersuch devices.

Another object is to supply in the pump coacting devices for alternately opening and closing. different sets lof inlet and outlet ports, to minimize pulsations in the delivery.

Another object' is to coordinate said coact* ingdevicesasto eliminate most of the noises usuallyk incident toY operation,

Another object is to arrange the elements 215 ofthe invention relatively to permit of substituting one operating.` element for another therein, whereby the force and quantity of fluid'I delivered inl a given time may be varied without changing the other associ'- V- ated and related elements;

I have successfully accomplished these objects in actual 'practice by the means which areffhereinafter" described and claimed, and which are illustrated in the accompanying 25 drawings, in which Fig. 1 is a vertical longitudinal axial section of the cylinder of vmy pumping device, with other' parts or elements shown in elevation or'brolren away.. Fig'. 2 is a cro'ss sectionY of thek pump taken onthebroken line 2-2 of'said Fig;- 1, and

Fig'. SVis another crosssection` ofthe device taken on the brokenline'S-B of Fig. 1.

My invention is not restrictedV to the precisef constructionV and `arrangement of parts u herein* shown and described, nor to the'vvariious details thereof, as the same may be mod'- y ied or rearranged in various particulars without departing. from thespirit andscope of." my invention, one practical embodiment 40 ofwhich has been herein" illustrated andV described without attemptingY to show all of the various forms and modifications in which my invention might be embodied.

My Apumping device has a cylinderbody v4,5 1 with opposite separable heads 2 and 8 secured thereon by machine screws 9. There are two sets of cylinder inlet and outlet ports .12 and 16e-17; respectively, o fwhich there is o'ne pair of longitudinally spaced inletports 5,0 l`2wofjoblong.d shape in the basal partof the cylinder, andtwo pairs of similarly shaped and longitudinally spaced outlet ports at 16 and 17, `positioned at opposite sides Vof the cylinder. In practicebut one pair of outlet ports on one side'of the cylinder are 55 used, the opposite pair being pluggedvby removable tlireaded screws 26 as shown in Fig. 8. Either set of Voutlet ports may` be usedA atxtin'ies,l as hereinafter described'. The inlet ports 12 are inclos'ed by ra blocl 13 fastened bythe screws 181removably, the block containing a cavity 14 leadingmedially Vintoa supply pipe 15, the endsrof this cavity being in communication with the ports 12. The outlet ports.1`6 and 17 are inclosed by like h'oll'owedV blocks 19, whose cavities of llileshape at 20'likewisefcommunicate with saidV ports at theV ends. `An outlet or delivery pipe not shown may be'in communication with either oneV of these side blocksrl-Q. `70

The opposite 'cylinder heads 2 and. .Shave respectively axialA hollowed bosses Y3 and' 10 projecting oppositely "outwardly, the-boss 3 having a bearingsoclret 5 of two l diameters Ya'sdoes the otherfboss, except that theboss 10 has itscentral' bearing opening extending therethrough to receive the rotatable shaft 7 driven by a belt-wheel 11'1, .the other endiof thef shaft being seated in thesocketin the boss 3i l so The numerals 27 and 35V denote'like but reversed cups of cylindrical' shape fitted loosely in thechamber 37 of said cylinder 1 and secured xedly on opposite parts of the' shaft 7 in spaced relation'.longitudinally, and have diminisliedlend parts5k keyedl at 6 on the shaft and seated in thewider portions of the hollows of the bosses 3 and 10 respectively.4 The cylinder 1v may have an aperture fservedby an oil-cup 2,5 at theftop.V The cups 27 and 35 have in their circumferentialwalls opposite oblong' ports`28z and* 30 vfor occasional communication withythe cylinder out letv ports 16 and 17 and the' inlet ports 12,y but the ports in the cupy 35 are positioned midway circumi'erentially relative to thelike ports. in -theother4 cup 27 while bothv cups Vhave small holes 36in their end wall'szfor a purpose' to be disclosed. i

The 'Y numeral '31 Ydenotes an elongated cylindrical solid body centrally axially apertured and splined at 34 on the shaft 7, serving as a double-ended plunger, and divided into two parts 33 and 32 by a circumferential medial cam-groove 31. The plunger is less in its length than the distance between the end walls of the cups 27 and 35, and at each side of the cam-groove 3l these parts have annular oil receiving grooves 29. The plunger is slidable on the shaft.

Midway of opposite sides of the cylinder 1 are threaded holes 21 to receive headed Screws 22 directed radially, and having within the chamber 37 diminished stems on which are mounted the anti-friction rollers 23. These rollers project into the cani groove 31 at opposite sides slightly spaced from its walls.

W'hen the shaft 7 is rotated, the cups 27 and 35 rotate with it, the ports 28 and 30 of the cups passing into communication with ports 16 and 17, also ports 12 in turn during each rotation. Simultaneously the stems 22 and their rollers 23, as the cylindrical niember 31 also rotates with the shaft, compel the member 31 to move slidingly along the shaft to one limit of movement, the cam groove returning the member to an opposite limit, to alternately in part or wholly cover or uncover the cup ports in thus controlling the cylinder ports in succession, according' to the longitudinal length of stroke of the cylinder 31 as determined by the relative curvatures of said cam groove. Suction thus engendered in opposite inclosed hollows of the cups 27 and 35 in alternation draws liquid from the inlet-pipe 15 thereinto to be delivered in turn into the outlet ports, as at the unplugged outlet 20. The placing of the respective cup ports 28 and 30 at relatively alternated positions respectively in the cups causes the general delivery at 20 to be practically free from pulsations.

As the cup ports 28 and 30 are spaced from the end walls of the cups, liquid normally remains to fill these hollows, serving as dash-pots for the plunger in minimizing shock and vibration of operation of the pump, hence lessening disagreeable noises.

The holes 36 in the cup end walls permit small quantities of the liquid to enter the chamber 37 at the ends and circumferentially which act as sealing medium around the working parts, without loss of efficiency, and to balance end pressure upon the cups, which saves power.

The pump elements are smoothly constructed, needing but little machining, hence promote economy in manufacture. lThe cups and plunger may be removed easily, and reversed upon the shaft 7, to reverse the operation of the pump, when the plug 26 has been relocated.

In Fig. 1 the reciprocable cylinder 31 is shown as not completely closing the cup ports at the ends of its stroke, but this is immaterial, as the pulsation caused is in any event very small and does not render the delivery of the pump ineffective, only variable according to the conditions. That is, if it is desired to vary the force of delivery to cause the device to become a force-pump, the Cylinderhead 2 may be removed together with the end cap 27 and the cylinder plunger 31, and another like cylinder 31 substituted having a iiatter cam groove 31 which causes a shorter stroke of this cylinder than the other. Then the shaft 7 with the cups 27 and 35 and the substituted cylinder 31 is given increased speed of rotation, whereby the pulsation is diminished, greater force given to the fluid or liquid delivered, and with a larger quantity delivered during a given time. The interior arrangement of 'the cylinder 1, the cups 27 and 35, and the cylinder plunger 31 relatively, is such as to facilitate the above function.

Having described my invention, what I claim as new. and desire to secure by Letters Patent, is:

1. A pumping device, comprising in combination, a relatively stationary cylinder having removable heads provided With shaft bearings, a rotatable shaft seated in said bearings, said cylinder having a pair of longitudinally spaced inlet-ports and also a pair of longitudinally spaced outlet-ports circumferentially at an angle to said inletports, a block removably secured on the cylinder across said inlet-ports, and a block removably secured on the cylinder across said outlet-ports, both blocks having longitudinal passages in communication at their ends with said inletand outletports respectively, and both blocks having portsv communicating medially with said passages,

Vspaced facing cups splined removably on said shaft and having ports alined circumferentially with both said inletand outletports, an imperforate piston splined slida-bly on said shaft within and fitting said cups and spaced from the inner end walls thereof, said piston having a medial circumferential cam groove, and a roller carrying pin mounted in said cylinder wall to tra, -verse the interspace between said cups and enter said cam groove.

2. A pumping device, comprising in combination, a relatively stationary cylinder having removable heads provided with shaft bearings, a rotatable shaft seated in said bearings, said cylinder having a pair of longitudinally spaced inlet-ports and also a pair of longitudinally spaced outlet-ports circumferentially at an angle to said inletports, a block removably secured on the cylinder across said inlet-ports, and a block removably secured on the cylinder across said outlet-ports, both blocks having longitudinal passages in communication at their ends `With said inletand outlet-ports respectively, and both blocks having ports communicating medially with said passages, spaced facing oups splined removably on said shaft and having ports alined circumferentially with both said inletand outletports, an imperforate piston splined slidably on said shaft Within: and fitting said cups and spaced from the inner end Walls thereof, said piston having a medial oiroumferential cam groove, the cylinder having a threaded opening in communication with the block passage over said outletports, a earn-pin having a threaded end seated removably in said threaded opening and having a cam roller thereon traversing the interspaee of said cups and extendin into the earn-groove of the piston', the en heads of said cups having smallapertures therein to pass a fluid through to the end interspaces of the cups andthe cylinderheads, and said piston having circumferential oil-receiving grooves at each side of its cam-groove.

In testimony vwhereof I afIix iny signature.

DAVID A. HARN ER. 

